“/”应用程序中的服务器错误。

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行 53:         //根据选中的id，选择对应的产品
行 54:         String selectSql1 = " and  classid='" + min_id + "'";
行 55:         int currentPage = Request["page"] == null || Request["page"].ToString() == "" ? 1 : int.Parse(Request["p age"].ToString());
行 56:         int pageSize = int.Parse(partno[0]["pagesize"].ToString());
行 57:         string strs = "'" + classid + "'" + "  as classid1 ";

[NullReferenceException: 未将对象引用设置到对象的实例。]
   en_producterlist.Page_Load(Object sender, EventArgs e) in f:\usr\localuser\hyw6875850001\en\producterlist.aspx.cs:55
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772